/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * apps/netutils/ftpc/ftpc_utils.c
 *
 *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "ftpc_config.h"

#include <stdlib.h>
#include <string.h>

#include "ftpc_internal.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: ftpc_nibble
 *
 * Description:
 *   Convert a ASCII hex 'digit' to binary
 *
 ****************************************************************************/

int ftpc_nibble(char ch)
{
	if (ch >= '0' && ch <= '9') {
		return (unsigned int)ch - '0';
	} else if (ch >= 'A' && ch <= 'F') {
		return (unsigned int)ch - 'A' + 10;
	} else if (ch >= 'a' && ch <= 'f') {
		return (unsigned int)ch - 'a' + 10;
	}
	return ERROR;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: ftpc_reset
 *
 * Description:
 *   Reset the FTP session.
 *
 ****************************************************************************/

void ftpc_reset(struct ftpc_session_s *session)
{
	ftpc_sockclose(&session->data);
	ftpc_sockclose(&session->cmd);
	free(session->uname);
	session->uname = NULL;
	free(session->pwd);
	session->pwd = NULL;
	free(session->initrdir);
	session->initrdir = NULL;
	session->flags &= ~FTPC_FLAGS_CLEAR;
	session->flags |= FTPC_FLAGS_SET;
	session->xfrmode = FTPC_XFRMODE_UNKNOWN;
	session->code = 0;
	session->replytimeo = CONFIG_FTP_DEFTIMEO * CLOCKS_PER_SEC;
	session->conntimeo = CONFIG_FTP_DEFTIMEO * CLOCKS_PER_SEC;
}

/****************************************************************************
 * Name: ftpc_lpwd
 *
 * Description:
 *   Return the local current working directory.  NOTE:  This is a peek at
 *   a global copy.  The caller should call strdup if it wants to keep it.
 *
 ****************************************************************************/

FAR const char *ftpc_lpwd(void)
{
#ifndef CONFIG_DISABLE_ENVIRON
	FAR const char *val;

	val = getenv("PWD");
	if (!val) {
		val = CONFIG_FTP_TMPDIR;
	}
	return val;
#else
	return CONFIG_FTP_TMPDIR;
#endif
}

/****************************************************************************
 * Name: ftpc_stripcrlf
 *
 * Description:
 *   Strip any trailing carriage returns or line feeds from a string (by
 *   overwriting them with NUL characters).
 *
 ****************************************************************************/

void ftpc_stripcrlf(FAR char *str)
{
	FAR char *ptr;
	int len;

	if (str) {
		len = strlen(str);
		if (len > 0) {
			ptr = str + len - 1;
			while (*ptr == '\r' || *ptr == '\n') {
				*ptr = '\0';
				ptr--;
			}
		}
	}
}

/****************************************************************************
 * Name: ftpc_stripslash
 *
 * Description:
 *   Strip any trailing slashes from a string (by overwriting them with NUL
 *   characters.
 *
 ****************************************************************************/

void ftpc_stripslash(FAR char *str)
{
	FAR char *ptr;
	int len;

	if (str) {
		len = strlen(str);
		if (len > 1) {
			ptr = str + len - 1;
			if (*ptr == '/') {
				*ptr = '\0';
			}
		}
	}
}

/****************************************************************************
 * Name: ftpc_dequote
 *
 * Description:
 *   Convert quoted hexadecimal constants to binary values.
 *
 ****************************************************************************/

FAR char *ftpc_dequote(FAR const char *str)
{
	FAR char *allocstr = NULL;
	FAR char *ptr;
	int ms;
	int ls;
	int len;

	if (str) {
		/* Allocate space for a modifiable copy of the string */

		len = strlen(str);
		allocstr = (FAR char *)malloc(len + 1);
		if (allocstr) {
			/* Search the string */

			ptr = allocstr;
			while (*str) {
				/* Check for a quoted hex value */

				if (str[0] == '%') {
					/* Extract the hex value */

					ms = ftpc_nibble(str[1]);
					if (ms >= 0) {
						ls = ftpc_nibble(str[2]);
						if (ls >= 0) {
							/* Save the binary value and skip ahead by 3 */

							*ptr++ = (char)(ms << 8 | ls);
							str += 3;
							continue;
						}
					}
				}

				/* Just transfer the character */

				*ptr++ = *str++;
			}

			/* NUL terminate */

			*ptr = '\0';
		}
	}

	return allocstr;
}
